A electroluminescence display device includes a pixel including a selection transistor, a driving transistor, and an EL element, a scanning signal line electrically connected with a gate of the selection transistor, a data signal line electrically connected with a source of the selection transistor, and a carrier injection amount control signal line applying a voltage to the EL element. The EL element includes a first electrode, a third electrode, a first insulating layer between the first electrode and the third electrode, an electron transfer layer between the first insulating layer and the third electrode, a light emitting layer containing an electroluminescence material between the electron transfer layer and the third electrode, and a second electrode located outer to a region where the first electrode, the first insulating layer, the electron transfer layer and the third electrode overlap each other, the second electrode being in contact with the electron transfer layer.
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2. The driving method according to claim 1, wherein the second voltage is a constant positive voltage.
3. The driving method according to claim 1, wherein the second voltage is fluctuating voltage that changes between a positive voltage of a first level and a positive voltage of a second level higher than the first level.
4. The driving method according to claim 1, wherein the second voltage is stepwise wave that increase or decrease.
5. The driving method according to claim 1, wherein the second voltage is a positive voltage that decreases from a first level V1 to a second level V2 and then decreases from the second level V2 to a third level V3 after a certain period of time.
6. The driving method according to claim 1, wherein the second voltage is a positive voltage that changes in a sinusoidal shape.
8. The driving method according to claim 7, wherein the second voltage is a constant positive voltage.
9. The driving method according to claim 7, wherein the second voltage is fluctuating voltage that changes between a positive voltage of a first level and a positive voltage of a second level higher than the first level.
10. The driving method according to claim 7, wherein the second voltage is stepwise wave that increase or decrease.
11. The driving method according to claim 7, wherein the second voltage is a positive voltage that decreases from a first level V1 to a second level V2 and then decreases from the second level V2 to a third level V3 after a certain period of time.
This invention relates to a driving method for a display device, specifically addressing the problem of improving display performance by controlling the voltage applied to a pixel circuit. The method involves applying a second voltage to a pixel circuit, where the second voltage is a positive voltage that decreases in a multi-step manner. Initially, the voltage decreases from a first level V1 to a second level V2, and after a certain period of time, it further decreases from V2 to a third level V3. This stepped voltage reduction helps in stabilizing the pixel circuit's operation, reducing power consumption, and enhancing display quality by preventing abrupt changes in voltage that could cause flicker or uneven brightness. The method is particularly useful in organic light-emitting diode (OLED) displays, where precise voltage control is critical for maintaining consistent luminance and extending the lifespan of the display components. The invention ensures smooth transitions in voltage levels, which is essential for achieving uniform and reliable display performance.
12. The driving method according to claim 7, wherein the second voltage is a positive voltage that changes in a sinusoidal shape.
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December 22, 2020
October 18, 2022
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